Constructor Detail

RenderableImageOp

Constructs a RenderedImageOp given a
ContextualRenderedImageFactory object, and
a ParameterBlock containing RenderableImage sources and other
parameters. Any RenderedImage sources referenced by the
ParameterBlock will be ignored.

Parameters:

CRIF - a ContextualRenderedImageFactory object

paramBlock - a ParameterBlock containing this operation's source
images and other parameters necessary for the operation
to run.

Method Detail

getSources

Returns a vector of RenderableImages that are the sources of
image data for this RenderableImage. Note that this method may
return an empty vector, to indicate that the image has no sources,
or null, to indicate that no information is available.

getPropertyNames

isDynamic

public boolean isDynamic()

Returns true if successive renderings (that is, calls to
createRendering() or createScaledRendering()) with the same arguments
may produce different results. This method may be used to
determine whether an existing rendering may be cached and
reused. The CRIF's isDynamic method will be called.

setParameterBlock

Change the current ParameterBlock of the operation, allowing
editing of image rendering chains. The effects of such a
change will be visible when a new rendering is created from
this RenderableImageOp or any dependent RenderableImageOp.

createScaledRendering

Creates a RenderedImage instance of this image with width w, and
height h in pixels. The RenderContext is built automatically
with an appropriate usr2dev transform and an area of interest
of the full image. All the rendering hints come from hints
passed in.

If w == 0, it will be taken to equal
Math.round(h*(getWidth()/getHeight())).
Similarly, if h == 0, it will be taken to equal
Math.round(w*(getHeight()/getWidth())). One of
w or h must be non-zero or else an IllegalArgumentException
will be thrown.

The created RenderedImage may have a property identified
by the String HINTS_OBSERVED to indicate which RenderingHints
were used to create the image. In addition any RenderedImages
that are obtained via the getSources() method on the created
RenderedImage may have such a property.

createDefaultRendering

Gets a RenderedImage instance of this image with a default
width and height in pixels. The RenderContext is built
automatically with an appropriate usr2dev transform and an area
of interest of the full image. All the rendering hints come
from hints passed in. Implementors of this interface must be
sure that there is a defined default width and height.

createRendering

Creates a RenderedImage which represents this
RenderableImageOp (including its Renderable sources) rendered
according to the given RenderContext.

This method supports chaining of either Renderable or
RenderedImage operations. If sources in
the ParameterBlock used to construct the RenderableImageOp are
RenderableImages, then a three step process is followed:

mapRenderContext() is called on the associated CRIF for
each RenderableImage source;

createRendering() is called on each of the RenderableImage sources
using the backwards-mapped RenderContexts obtained in step 1,
resulting in a rendering of each source;

ContextualRenderedImageFactory.create() is called
with a new ParameterBlock containing the parameters of
the RenderableImageOp and the RenderedImages that were created by the
createRendering() calls.

If the elements of the source Vector of
the ParameterBlock used to construct the RenderableImageOp are
instances of RenderedImage, then the CRIF.create() method is
called immediately using the original ParameterBlock.
This provides a basis case for the recursion.

The created RenderedImage may have a property identified
by the String HINTS_OBSERVED to indicate which RenderingHints
(from the RenderContext) were used to create the image.
In addition any RenderedImages
that are obtained via the getSources() method on the created
RenderedImage may have such a property.